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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0336887efa4c0fda0adc7282eb1b3512531a873e88edc78558caeeece31a334c' 
  AND token = 'dmHuj5waXU9O0jjusP82v/QR+pYNG7xSOU9W2ZoK2GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}